What is needed for work to be done?
a force must push on an object without moving it.
a force must pull on an object without moving it.
a force must cause an object to move along the same direction as the force.
a force must act on an object while an equal force acts oppositely on the object.

Compare and contrast physical changes with chemical changes.

Which sentence from holes contains an implied personality trait? stanley and his parents had tried to pretend that he was just going away to camp for a while, just like rich kids do. he'd just been in the wrong place at the wrong time. stanley felt somewhat dazed as the guard unlocked his handcuffs and led him off the bus. stanley nodded to show he understood

Which of the following molecules is polar? c3h7oh c2h5cooh